Mandolin brand name "Osborn" made in Chicago. The Osborn Manufacturing Co. was established in 1897 at Chicago, IL by Samuel C. Osborn. They built guitars, mandolins, banjos, ukuleles and other small musical instruments, along with a zither variant for which Osborn was issued patents in 1917. In 1921 they claimed the largest factory of its kind in the country. The instruments were marketed under the Sammo and the Sammos trade marks, the latter being made entirely from koa wood. They were still in...